1. SessionStart hook first-run-onboard.sh: on first Claude Code session after
install, nudges user/Claude to run `/onboard ~/Projects/*` (scan stack +
create a project-specialist agent per project; delegates to /new-agent).
Fires once (marker), then silent. Wired in settings-snippet under SessionStart.
2. lib-summary next-steps: lead with /onboard ~/Projects/*, then /new-agent.
3. lib-hooks merge: normalize null/absent matcher → "" (Claude Code /doctor
rejects null; pre-kit hooks often lack a matcher field).
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>